So after adding more smoke fluid with no result I decided to remove the body so that I could inspect the smoke unit. While the wick was damp, there was no fluid in the bottom of the reservoir. I had added 20 initially and then another 20-30 subsequently....... I did turn the engine over a couple of times to see where the body screws were etc... so it's certainly possible that fluid had fallen out of the reservoir at some point.
I added a good 45 or so drops directly into the reservoir and replaced the body and now she's smokin' like a son of a gun..... so both Rick and Gunner John were right on the money with their diagnostics....
MTHs instructions in this regard (add 15-20 drops to a new engine) are not really helpful and could potentially cause burnt wicks due to operators being overly neurotic about flooding the smoke unit and the engine and risking damage to electronics....
Maybe 60-70 drops is too much but 40-50 doesn't seem to be and 20 risks another set of issues or problems........
Mike